The race to defeat Trump has begun in earnest. There are 19 notable candidates in the Democratic primary race already and that doesn't include some big names that are expected to enter the race, but haven't yet. Why are there so many? There were only six in 2016. One theory is that Trump appears vulnerable so it's anybodies race. Even people who were traditionally to radical or progressive to win a nationwide election feel like they could beat Trump, but can they, and what does the moderate progressive split mean for the primaries?